Merge "Revert "Allow bar to be transparent if letterbox contains bar"" into rvc-dev am: 64682e76 am: fe5a7698 am: 440fe46e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12128053

Change-Id: I421dc13817191b1151157a92f284775343b369f3